Go through the main entrance.

Risky. But it's the fastest way. With her nimble body Rouge sneaks past the searchlights and the guards. Her high heals making barely any noise as she run past another patrol, her massive chest swaying slightly. She climb past a fence and lands inside the facility. Now all that separates the thief from the entrance is a small run through the helipad. This is the most risky part but there is no going back now. She rushes as fast as she can to the entrance. And then...